Senpai is a nerdy high schooler whose manga work is discovered by some loud girls in the library. They all tease him, but one among them, Nagatoro, takes it further than the others.

Nagatoro torments Senpai by threatening to suck his blood like a vampire and by making him play a nipple-finding game. Senpai escapes to a family restaurant, where he runs into Nagatoro and her friends and discovers something surprising.

Senpai and Nagatoro get caught in the rain. She invites him over to wait for the rain to pass. Senpai sits with Nagatoro and her friends for lunch, and things get awkward.

Nagatoro offers to cut Senpai’s hair. Just as she’s about to get started, she gets a call from her friends, and things take an odd turn. Senpai and Nagatoro line up for ice cream on a scorching summer day.

Senpai awakens in another world, where he and Nekotoro set out on an adventure to defeat the demon king. Nagatoro invites Senpai to the beach.

The summer festival is coming up. Senpai is expecting Nagatoro to invite him, but that’s not how either of them end up going.

Senpai should be studying for midterms, but he’s hooked on a game. Questions arise about what might happen if he were to flunk. Senpai and Nagatoro play rock-paper-scissors to see who has to carry their bags home.

Nagatoro makes a bet that Senpai has lewd books in the club room, but things don’t go quite as she plans. Sakura has a stalker, and she asks Senpai for help getting rid of him.

After seeing Senpai get mocked for his inability to run, Nagatoro takes him out jogging to try to whip him into shape. The culture festival is coming up, and Senpai needs something to present for the arts club.

Senpai doesn’t have any confidence that he can win against the art club president. Nagatoro and the gang try to cheer him up, but the president’s art is just too powerful. Nagatoro offers to model for Senpai.

Senpai isn’t sure he can beat the art club president in popularity at the culture festival. Nagatoro and the gang do everything they can to help him.

Nagatoro is still torturing Senpai, laughing at his choice of manga and at how he talks to girls, and trying to get a reaction out of him by having him put her stockings on her.

The club president gives Senpai tickets to the zoo, insisting that he takes Nagatoro with him to practice life drawing together.

Nagatoro forgets her phone in the club room. Senpai tries to bring it back to her but gets himself into a situation.

Senpai visits Nagatoro’s home to deliver handouts from school. Her sister lets him in and decides to mess with both him and Nagatoro.

Senpai gets sick, so Nagatoro comes over to check on him. His family happens not to be home.

Senpai has a Christmas gift for Nagatoro, but The Friends get in the way of him handing it to her.

Senpai, Nagatoro and their classmates go skiing. Nagatoro is a good skier, but Senpai doesn't fail to disappoint.

Senpai sketches Nagatoro in an athletic stance that seems very natural to her. Wait, is Nagatoro into judo...?

The school judo tournament is coming up. Senpai and Nagatoro are both reluctant to participate.

It's the start of a new school year. Nagatoro is planning to join the judo club and the art club gets a new member.

Sunomiya encourages Senpai to ask Nagatoro out on a date. On a late walk home Senpai tries to ascertain if Nagatoro has anywhere she'd like to go on her next school break.

Pursued by Gamo and Yoshi who aim to preserve Senpai's virginity and Sunomiya and the President who aim to protect and fight for Senpai's love, Nagatoro and Senpai set off on their date to the aquarium.